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Allowance for Credit Losses and Credit Quality of Loans, Credit Quality Indicators (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]          
Minimum number of days past due for loans to be considered nonperforming     90 days    
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 $ 750,183   $ 750,183   $ 1,952,599
2022/2021 1,841,436   1,841,436   1,615,395
2021/2020 1,498,097   1,498,097   1,012,149
2020/2019 930,442   930,442   774,792
2019/2018 698,192   698,192   518,993
Prior 1,739,087   1,739,087   1,414,638
Revolving Loans Amortized Cost Basis 854,937   854,937   800,156
Revolving Loans Converted to Term 45,750   45,750   61,425
Total 8,358,124   8,358,124   8,150,147
Gross Charge-offs by Loan Class by Vintage [Abstract]          
2023     (253)    
2022     (2,922)    
2021     (4,731)    
2020     (1,146)    
2019     (930)    
Prior     (1,017)    
Revolving Loans Amortized Cost Basis     0    
Revolving Loans Converted to Term     0    
Total (5,149) $ (4,046) (10,999) $ (8,537)  
C&I [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 130,595   130,595   297,682
2022/2021 288,408   288,408   253,483
2021/2020 227,937   227,937   169,738
2020/2019 148,066   148,066   94,817
2019/2018 79,794   79,794   40,593
Prior 58,223   58,223   36,800
Revolving Loans Amortized Cost Basis 366,033   366,033   344,748
Revolving Loans Converted to Term 11,856   11,856   3,296
Total 1,310,912   1,310,912   1,241,157
Gross Charge-offs by Loan Class by Vintage [Abstract]          
2023     0    
2022     (1)    
2021     (5)    
2020     (63)    
2019     0    
Prior     (193)    
Revolving Loans Amortized Cost Basis     0    
Revolving Loans Converted to Term     0    
Total     (262)    
C&I [Member] | Pass [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 129,726   129,726   296,562
2022/2021 284,195   284,195   252,480
2021/2020 226,716   226,716   164,976
2020/2019 143,819   143,819   91,497
2019/2018 77,298   77,298   39,394
Prior 56,009   56,009   32,413
Revolving Loans Amortized Cost Basis 338,877   338,877   327,166
Revolving Loans Converted to Term 9,668   9,668   3,133
Total 1,266,308   1,266,308   1,207,621
C&I [Member] | Special Mention [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 0   0   1,044
2022/2021 2,440   2,440   524
2021/2020 421   421   4,531
2020/2019 3,610   3,610   194
2019/2018 40   40   1,108
Prior 380   380   417
Revolving Loans Amortized Cost Basis 4,654   4,654   5,234
Revolving Loans Converted to Term 0   0   0
Total 11,545   11,545   13,052
C&I [Member] | Substandard [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 869   869   76
2022/2021 1,772   1,772   459
2021/2020 733   733   231
2020/2019 587   587   3,098
2019/2018 2,452   2,452   91
Prior 1,819   1,819   3,969
Revolving Loans Amortized Cost Basis 22,502   22,502   12,348
Revolving Loans Converted to Term 2,188   2,188   163
Total 32,922   32,922   20,435
C&I [Member] | Doubtful [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 0   0   0
2022/2021 1   1   20
2021/2020 67   67   0
2020/2019 50   50   28
2019/2018 4   4   0
Prior 15   15   1
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term 0   0   0
Total 137   137   49
CRE [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 144,657   144,657   375,227
2022/2021 385,237   385,237   466,754
2021/2020 462,767   462,767   442,196
2020/2019 421,626   421,626   340,146
2019/2018 326,468   326,468   223,612
Prior 757,320   757,320   614,625
Revolving Loans Amortized Cost Basis 244,465   244,465   203,126
Revolving Loans Converted to Term 15,550   15,550   29,722
Total 2,758,090   2,758,090   2,695,408
Gross Charge-offs by Loan Class by Vintage [Abstract]          
2023     0    
2022     0    
2021     0    
2020     0    
2019     (114)    
Prior     0    
Revolving Loans Amortized Cost Basis     0    
Revolving Loans Converted to Term     0    
Total     (114)    
CRE [Member] | Pass [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 144,348   144,348   374,313
2022/2021 382,793   382,793   465,990
2021/2020 449,149   449,149   439,012
2020/2019 412,649   412,649   333,568
2019/2018 313,179   313,179   217,141
Prior 698,047   698,047   566,783
Revolving Loans Amortized Cost Basis 229,150   229,150   201,563
Revolving Loans Converted to Term 15,550   15,550   24,735
Total 2,644,865   2,644,865   2,623,105
CRE [Member] | Special Mention [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 0   0   605
2022/2021 2,251   2,251   764
2021/2020 6,722   6,722   868
2020/2019 3,354   3,354   2,641
2019/2018 10,119   10,119   4,649
Prior 14,216   14,216   24,023
Revolving Loans Amortized Cost Basis 13,768   13,768   850
Revolving Loans Converted to Term 0   0   0
Total 50,430   50,430   34,400
CRE [Member] | Substandard [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 309   309   309
2022/2021 193   193   0
2021/2020 6,896   6,896   2,316
2020/2019 5,623   5,623   3,937
2019/2018 3,170   3,170   1,822
Prior 45,057   45,057   23,819
Revolving Loans Amortized Cost Basis 1,547   1,547   713
Revolving Loans Converted to Term 0   0   4,987
Total 62,795   62,795   37,903
Auto [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 249,677   249,677   489,366
2022/2021 418,642   418,642   239,745
2021/2020 194,620   194,620   76,257
2020/2019 57,048   57,048   100,000
2019/2018 69,627   69,627   44,277
Prior 29,488   29,488   13,056
Revolving Loans Amortized Cost Basis 14   14   0
Revolving Loans Converted to Term 0   0   0
Total 1,019,116   1,019,116   962,701
Gross Charge-offs by Loan Class by Vintage [Abstract]          
2023     (30)    
2022     (525)    
2021     (516)    
2020     (204)    
2019     (165)    
Prior     (130)    
Revolving Loans Amortized Cost Basis     0    
Revolving Loans Converted to Term     0    
Total     (1,570)    
Auto [Member] | Performing [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 249,677   249,677   488,776
2022/2021 418,275   418,275   239,090
2021/2020 193,855   193,855   75,853
2020/2019 56,852   56,852   99,615
2019/2018 69,477   69,477   44,061
Prior 29,327   29,327   13,027
Revolving Loans Amortized Cost Basis 14   14   0
Revolving Loans Converted to Term 0   0   0
Total 1,017,477   1,017,477   960,422
Auto [Member] | Nonperforming [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 0   0   590
2022/2021 367   367   655
2021/2020 765   765   404
2020/2019 196   196   385
2019/2018 150   150   216
Prior 161   161   29
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term 0   0   0
Total 1,639   1,639   2,279
Residential Solar [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 129,390   129,390   486,262
2022/2021 448,024   448,024   194,069
2021/2020 185,491   185,491   74,582
2020/2019 69,994   69,994   54,687
2019/2018 50,490   50,490   36,135
Prior 42,976   42,976   11,063
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term 0   0   0
Total 926,365   926,365   856,798
Gross Charge-offs by Loan Class by Vintage [Abstract]          
2023     0    
2022     (578)    
2021     (428)    
2020     (45)    
2019     (164)    
Prior     (139)    
Revolving Loans Amortized Cost Basis     0    
Revolving Loans Converted to Term     0    
Total     (1,354)    
Residential Solar [Member] | Performing [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 129,390   129,390   485,942
2022/2021 447,725   447,725   193,971
2021/2020 185,410   185,410   74,532
2020/2019 69,994   69,994   54,662
2019/2018 50,419   50,419   36,119
Prior 42,927   42,927   11,019
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term 0   0   0
Total 925,865   925,865   856,245
Residential Solar [Member] | Nonperforming [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 0   0   320
2022/2021 299   299   98
2021/2020 81   81   50
2020/2019 0   0   25
2019/2018 71   71   16
Prior 49   49   44
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term 0   0   0
Total 500   500   553
Other Consumer [Member]          
Financing Receivable, Credit Quality Indicator [Line Items]          
Overdrawn deposit related to gross charge-offs reported as 2022 originations     200    
Overdrawn deposit related to gross charge-offs reported as 2023 originations     200    
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 7,876   7,876   52,783
2022/2021 36,471   36,471   111,462
2021/2020 82,150   82,150   36,807
2020/2019 27,611   27,611   27,630
2019/2018 20,105   20,105   15,593
Prior 22,199   22,199   15,822
Revolving Loans Amortized Cost Basis 17,428   17,428   19,226
Revolving Loans Converted to Term 43   43   265
Total 213,883   213,883   279,588
Gross Charge-offs by Loan Class by Vintage [Abstract]          
2023     (223)    
2022     (1,818)    
2021     (3,700)    
2020     (834)    
2019     (487)    
Prior     (193)    
Revolving Loans Amortized Cost Basis     0    
Revolving Loans Converted to Term     0    
Total     (7,255)    
Other Consumer [Member] | Performing [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 7,876   7,876   52,545
2022/2021 36,057   36,057   110,624
2021/2020 81,241   81,241   36,412
2020/2019 27,518   27,518   27,383
2019/2018 20,021   20,021   15,536
Prior 21,995   21,995   15,735
Revolving Loans Amortized Cost Basis 17,423   17,423   19,218
Revolving Loans Converted to Term 14   14   250
Total 212,145   212,145   277,703
Other Consumer [Member] | Nonperforming [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 0   0   238
2022/2021 414   414   838
2021/2020 909   909   395
2020/2019 93   93   247
2019/2018 84   84   57
Prior 204   204   87
Revolving Loans Amortized Cost Basis 5   5   8
Revolving Loans Converted to Term 29   29   15
Total 1,738   1,738   1,885
Residential [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 87,988   87,988   251,279
2022/2021 264,654   264,654   349,882
2021/2020 345,132   345,132   212,569
2020/2019 206,097   206,097   157,512
2019/2018 151,708   151,708   158,783
Prior 828,881   828,881   723,272
Revolving Loans Amortized Cost Basis 226,997   226,997   233,056
Revolving Loans Converted to Term 18,301   18,301   28,142
Total 2,129,758   2,129,758   2,114,495
Gross Charge-offs by Loan Class by Vintage [Abstract]          
2023     0    
2022     0    
2021     (82)    
2020     0    
2019     0    
Prior     (362)    
Revolving Loans Amortized Cost Basis     0    
Revolving Loans Converted to Term     0    
Total (105) $ (90) (444) $ (402)  
Residential [Member] | Performing [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 87,959   87,959   251,012
2022/2021 264,222   264,222   349,498
2021/2020 344,895   344,895   212,161
2020/2019 205,768   205,768   156,957
2019/2018 151,242   151,242   157,755
Prior 822,754   822,754   717,621
Revolving Loans Amortized Cost Basis 226,997   226,997   233,056
Revolving Loans Converted to Term 18,301   18,301   28,122
Total 2,122,138   2,122,138   2,106,182
Residential [Member] | Nonperforming [Member]          
Credit Quality by Loan Class by Vintage [Abstract]          
2023/2022 29   29   267
2022/2021 432   432   384
2021/2020 237   237   408
2020/2019 329   329   555
2019/2018 466   466   1,028
Prior 6,127   6,127   5,651
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term 0   0   20
Total $ 7,620   $ 7,620   $ 8,313